Linda,

I have checked that I have bug and security updates in place, to
the best of my knowledge.

I have updated the product price sorter several times.

The thing I find most unsettling is that the sort by price seems to work in one or two categories, but not in most of them. Since I can
not imagine that the code performing the sort function works
differently for different categories, I can only assume that there
is something in the database that is causing the problem.

I have looked at the database, using phpMyAdmin, and the
product table shows that the products_price_sorter and
master_categories_id fields have values. However, one thing
I see that is peculiar is that some products have the
manufacturers_id = NULL and others have the
manufacturers_id = 0 (zero) . Might this be having an adverse
effect on the sort function?

If you want it, I can send a copy of the product table.

Any suggestions ?